File:Pyrite concretions in black shale (Blocher Member, New Albany Shale, Devonian; Harding Street Quarry, Indianapolis, Indiana, USA) 1 (18859496909).jpg
Original file (1,196 × 781 pixels, file size: 1.19 MB, MIME type: image/jpeg)
Captions
Captions
Summary
[edit]_1_(18859496909).jpg&action=edit§ion=1){kind=link}
| Description |
Pyrite concretions in black shale from the Devonian of Indiana, USA. (entire specimen is 10.1 cm across along the base) A mineral is a naturally-occurring, solid, inorganic, crystalline substance having a fairly definite chemical composition and having fairly definite physical properties. At its simplest, a mineral is a naturally-occurring solid chemical. Currently, there are over 4900 named and described minerals - about 200 of them are common and about 20 of them are very common. Mineral classification is based on anion chemistry. Major categories of minerals are: elements, sulfides, oxides, halides, carbonates, sulfates, phosphates, and silicates. The sulfide minerals contain one or more sulfide anions (S-2). The sulfides are usually considered together with the arsenide minerals, the sulfarsenide minerals, and the telluride minerals. Many sulfides are economically significant, as they occur commonly in ores. The metals that combine with S-2 are mainly Fe, Cu, Ni, Ag, etc. Most sulfides have a metallic luster, are moderately soft, and are noticeably heavy for their size. These minerals will not form in the presence of free oxygen. Under an oxygen-rich atmosphere, sulfide minerals tend to chemically weather to various oxide and hydroxide minerals. Pyrite is a common iron sulfide mineral (FeS2). It’s nickname is “fool's gold”. Pyrite has a metallic luster, brassy gold color (in contrast to the deep rich yellow gold color of true gold - www.flickr.com/photos/jsjgeology/sets/72157651325153769/), dark gray to black streak, is hard (H=6 to 6.5), has no cleavage, and is moderately heavy for its size. It often forms cubic crystals or pyritohedrons (crystals having pentagonal faces). Pyrite is common in many hydrothermal veins, shales, coals, various metamorphic rocks, and massive sulfide deposits. Stratigraphy: Blocher Member, lower New Albany Shale, Devonian, upper Middle Devonian to lower Upper Devonian Locality: Lehigh-Hanson's Harding Street Quarry, southern side of Indianapolis, central Indiana, USA (39° 42' 04.94" North, 86° 12' 23.38" West) Photo gallery of pyrite: www.mindat.org/gallery.php?min=3314 |
| Date | |
| Source | Pyrite concretions in black shale (Blocher Member, New Albany Shale, Devonian; Harding Street Quarry, Indianapolis, Indiana, USA) 1 |
| Author | James St. John |
Licensing
[edit]_1_(18859496909).jpg&action=edit§ion=2){kind=link}
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
|
This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/18859496909. It was reviewed on 19 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:34, 19 July 2015 | | 1,196 × 781 (1.19 MB) | Natuur12 (talk | contribs) | Transferred from Flickr via Flickr2Commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
_1_(18859496909).jpg&oldid=918992551){kind=link}